Chapter 4, Problem 5RQ

### Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

Chapter
Section

### Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

# At sea level, the alveolar water vapor pressure in normally aboutA. 0.2 mm HgB. 47 mm HgC. 0.0 mm HgD. 40 mm Hg

Summary Introduction

Introduction:

The state in which water exists depends on the pressure and temperature of the surroundings. When water is present in gaseous state, water vapor, it behaves according to the gas laws. This results in providing the water vapor with partial pressure. As soon as the dry air from the atmosphere enters the body, it is humidified by water vapors and the partial pressure of the air is reduced.

Explanation

Justification/ Explanation for the correct answer:

Option (B) is 47 mm Hg. The saturated water vapor pressure in alveoli has the given value. This value of the partial pressure remains the same even when the humidity of the inspired air varies. This partial pressure is acquired by the water when it is present in the gaseous state. When oxygen enters the body, the partial pressure of oxygen is reduced by the partial pressure of water vapor to 150 mm Hg. Hence, option (B) is correct.

Option (A) is 0...

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